Noone knows and Nokia aren't saying how it is that they chose a graphics chip which has acceleration and yet their driver cannot make proper use of it! As far as I know, the only thing they use is image scaling allowing playback of video at arbitrary rez; the 770 was more basic and could only double the pixels. However, the 800/810 has a faster processor than the 770, not just clock speed but also CPU architecture I think.

BTW2, the 800 and 810 have a flaw in their design and cannot use the full cpu to video bandwidth that's theoretically possible with either device.

This is why FMV video for the 800 is not possible even though in theory it could very nearly have been.